You can use bold text on your iPhone in text messages by creating a subject line after enabling the feature in Settings. Here's how to do it.

Messages can solve simple math equations like "2+2=" by typing them into the text field. The app can also solve equations that use more complex formulas, such as the trigonometric functions of sine, ...

While you can't italicize text when sending messages on an iPhone, you can italicize on an iPhone in Mail, Notes, and Pages. Here's how to do each.

When you send an iPhone text message, it’s natural to wonder if the recipient has read it. The Messages app on iPhone includes a feature called read receipts, which allows you to see if and when your ...